Hey Psa, I need some help. I purchased a complete used engine, got it put in, but cannot get any rail pressure. I've bled the system, using Ids to turn on the lp pump, cracking both lines on the fuel cooler. Have great flow there, but rail pressure only shows ~23 psi. Took the hp line off at the left head and no fuel when cranking. What am I missing? No codes other then low icp while gm ranking. Thanks